lesvos is reknowned for a lot of lesbians going on vacation, since the word derives from the name of the island...a few friends went this summer for a week or so and told me it is full of ugly women with pissed off looks on their faces...if you want to get laid there are many options...here are some...
mykonos-expensive and full of gays, but also many nice looking girls of different nationalities
ios-another party island, it is cheaper, no gay people, and many drunk girls
hersonisos in crete-area in the north of the huge island, it is full of foreigners (mostly scandinavian and anglo saxon). the only greek people you will meet there are the ones that work there.
rhodes-large island in eastern sea, many brothels because of army bases...i am not sure about quality.
as for the other islands mentioned, i have never heard of prostitution.
molyvos i have never heard of